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The Americas is a term used to refer to the American supercontinent: the continents of North America, South America, and the isthmus of Central America. The Americas are in the Western Hemisphere and cover 8.3% of the earth's surface.
"The Americas" is a plural noun. This means the is used in a complete sentence. Thus we say "There are many countries in the Americas."
The word American is usually used to mean a person or a thing from the United States of America. People and things from any country in any of the Americas—North America, Central America, or South America—are sometimes called "American".